Boost.Range added unit tests for extended algorithms.

Put the extended algorithms into boost::range in a similar manner to the standard algorithms.
Added iota as an extended algorithm.
Fixed defects in the extended algorithms brought to light by the new unit tests.

[SVN r61042]

test/algorithm_ext_test/copy_n.cpp

@@ -0,0 +1,60 @@
+// Boost.Range library
+//
+//  Copyright Neil Groves 2010. Use, modification and
+//  distribution is subject to the Boost Software License, Version
+//  1.0. (See accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+#include <boost/range/algorithm_ext/copy_n.hpp>
+
+#include <boost/test/test_tools.hpp>
+#include <boost/test/unit_test.hpp>
+
+#include <boost/range/iterator.hpp>
+#include <algorithm>
+#include <list>
+#include <vector>
+
+namespace
+{
+    template< class Container >
+    void test_copy_n_impl()
+    {
+        std::vector<std::size_t> source;
+        for (std::size_t i = 0; i < 10; ++i)
+            source.push_back(i);
+
+        for (std::size_t k = 0; k < 10; ++k)
+        {
+            std::vector<std::size_t> reference;
+            for (std::size_t j = 0; j < k; ++j)
+                reference.push_back(j);
+
+            Container test;
+            boost::copy_n(source, k, std::back_inserter(test));
+
+            BOOST_CHECK_EQUAL_COLLECTIONS( reference.begin(), reference.end(),
+                test.begin(), test.end() );
+        }
+    }
+
+    void test_copy_n()
+    {
+        test_copy_n_impl< std::vector<std::size_t> >();
+        test_copy_n_impl< std::list<std::size_t> >();
+    }
+}
+
+boost::unit_test::test_suite*
+init_unit_test_suite(int argc, char* argv[])
+{
+    boost::unit_test::test_suite* test
+        = BOOST_TEST_SUITE( "RangeTestSuite.algorithm_ext.copy_n" );
+
+    test->add( BOOST_TEST_CASE( &test_copy_n ) );
+
+    return test;
+}